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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ee8a7cdee606b2cc47aea7a8bfe8b95e892e1850c233b00ea8bf2aa89737b6' 
  AND token = 'xiIfoHlXUZtTZr6U27t4iS/VQOlxmpBbdx7tiOjRyUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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