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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f4a74593b08b7b709976d81760e9191e97ec862c5a76d83dd213b810fc3a74' 
  AND token = 'jA73D5BjPC6iMZJli/qev0slUh/rEcp9TAjhfKEraf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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