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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e410e0ca4670884bbe21a1e52aa33884601180c0d5dc9016f84f125cf28b55' 
  AND token = 'QFXJb6eoHOM0bQTKy7aVm05W9VQUES602T20pTfUGJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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