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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943e14252489ce8dbb189c78fc0f814305a7bd2b3fd07dba0cc2dbd40209dbc7' 
  AND token = 'CET5WXj/OxeDydLkYzao5M9bIGSCTI4U7OskHfR66ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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