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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912ae28c93c1ecb5ffe50e3d856ab3affa9fc3d55011d2f93174ddec4e63a798' 
  AND token = 'eBVZY3cKc5q6eHSfEiX4jfXKX0Zh76N5d4EuI4MC6CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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