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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305926a6263b8e95a6b4154702fec13f7242299dc09511ddb033d8a02d8a3239' 
  AND token = 'S6nkHHgk8vFSgG66EsejPHnkSdacm94LbXDwa6iraNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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