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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3105410c122d0ae930e578d2f6f92fdeaf9aa7f1cf8006d3aeb870a51820c712' 
  AND token = 'fzw/V65iuya4Yj2eGrNMsQRNGtquSIF40V4t1F4Fao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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