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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe37ab58a71477e1a1b11efbd2a152d9e03807dbc7660080fe29d958eabbc6c' 
  AND token = 'maUV8s/tk95re3E6Nge4AVl+Val5alhAFmjHKqvPMLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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