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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9580981eb7f8d4b9c3996a6f9ed3c3a26115291b11374cc60c13ffc9100e3ab' 
  AND token = 'oGwvRvVGd5wjmcnv6kdo/XufKO7d17uhxmoAImNlYPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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