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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8606c18699e4fb90c70273eec2f5e9abcaf35966c6a468f6a38a908617bd9d' 
  AND token = 'I2djXkqpRGS5/QLjtRSztWURdoYEIQanZDI93x0A2Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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