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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d913d2ac1afc7b5c23b38ba4dfab4f709c4772c7dc13b8de6919d38db0a7c7' 
  AND token = 'c58bKuj3a8x8O+JNwJt9JLf6SJ9Euo8ecAoeNMPbNAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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