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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee31775fc742b1a9e70da09a64437e2dbbb22c141f2e202d6d19b74776ae0dda' 
  AND token = 'HH0Qnt5ZYVqsfPbxVSMM/YlX8H2COkoNudr/4BeLTro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}