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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3067137e9aa5ed8a09c16549589ef41aa8c4f38c67e8b57c9616ab33c439daba' 
  AND token = 'ANAOoVlssja3wEQeclG956uH98X/9zAGpMlRR3d3rio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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