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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8211e26bacbd1abad5b433adf68474bf45fd67a9d42f87a22c3990d4866f0423' 
  AND token = 'vn1NCPGpDRT9sJ+16BRiD3+O3I9i3DybJL/Yyuajk8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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