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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eab2a04a279086992741cd6f9559e34de58988071ca6ef730f1d93e84dacb12' 
  AND token = '6S4m0N1Tu8Ee9HkYw5SLPBWr5Re/tdGmqhQ2mmdTycM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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