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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4cdd1fa98d64702e35c1f4bba13bc62c03961c6b378e5959ca9d452c3ce5b8' 
  AND token = 'lSNbdBiM4VgvKnpj9rLC5gVojz+32tmy3ikBUWN1hl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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