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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74268098a2262c474ae37edd33d6ebd9b66aae1536646625a9d632fa0250fc19' 
  AND token = '9foq+qr3Mkr4IVMmnf607+qgnAc4shOC0i7wC1s4q98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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