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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a01b2b18529f810a7cf1e636ccd0b137248c4bc1b6abca1d3ab13ce4294aded' 
  AND token = 'UBFcc91gqqh2TcNurX06txk6ns45PC0zN8TcdaXnZIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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