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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100761fa6b3dc2544b09d420336ec6bb162510569d02becd45a0dff014925feb' 
  AND token = '9cqTeqJ+EQlv7q4RNMqQTu8YoJvYkI8bPpYSxlx0Tbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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