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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2804fa2c66eff9558ce2dc26a49d65fdeec80221611d7ccebcf1dbdfe3841383' 
  AND token = '1NrP+/JMmMENv3zupQsXI+Qpo53R9XyvsdDv18Qa1/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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