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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c719c3da895c32837eb9fd5304fe3cb6486f515f06ef41771e358159181ba5c3' 
  AND token = 'xqvm9S5o/Wz76eG7RYIH9st4uRKWAFULr0WUI6836vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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