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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e060edf98e2472b64030f870fa6ce399b1e8daa6d931dd3df95d23c4365bc56e' 
  AND token = 'otUUh0wI3Ha+1Ah0jc+Gcfwc0ZB6bP/bH17tanGiZuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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