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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab1ac6a21315d76444691d016c100850476e9775dbafc9e137f8a0ebd08962c' 
  AND token = 'tzHms4XwrgWaEIf1LkV4la1PBPgdqOKNIXmwuDDvudk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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