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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee3cd7665afa2ee9192f6d6fd049276ddd711f351cc8c860eef7f8c54e6aaff' 
  AND token = 'nS2/ZGnTPfjPhwkeIPJcqD39xmewDWJGzNMTnTioGqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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