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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3996738a7863ef855b11c388ab279427fa3a5cbbe3afea0b2b319141dc3a6579' 
  AND token = 'UuoNniLfbE+ZzZz2w6u1DDbHZdTUBddzEeG5WyRsp+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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