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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5637c9426cd1550f3bffbce25c24934c3b05028497b970dedc1cf027b3117238' 
  AND token = 'U0CW1e3aajry/9oaEohEFXfcajNvelda2Dj9znjQNKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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