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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f533e0a9deb0cbead87d1e7a150cd8ff50e9011c30fb5094dab763e5d732b0e' 
  AND token = 'EF9qEgOMAvvsVsN4tFWF9Nl/rbsN4WeDNcfYDv6TF3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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