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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac082b1901ca56592d0532b005eb5bbd6c72a9696ca8f670d5351abd3a51233' 
  AND token = 'fj1nPzEpHI0kqF0q4AOXMddsXixQYU/Q1ChgO3gcK5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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