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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ce4813116e022211d46df514156343c8fa3ad39f5cbe920e642cb430648f2b' 
  AND token = '1dy20zM5o5x4NtBXjS6fsB92ibx11NsnieAAMsKNrls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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