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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db713f4dc991deddedf23fc25bc5e3945a9dd3a49d8fd83bbfa3f53fd470bceb' 
  AND token = 'y1FVD7GQEPWymuc7bS1bbPf97SyiPwvUawSDoUPDSfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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