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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3f472919200e692d9f64934e4b0f8ab1087dcbdbce3f33da6fb440829a466d' 
  AND token = 'vE8fV7zsb4a/HqfGMAQEtmu6YNLUZ3MzC1DyzyyeXro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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