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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe60e345c37f2770ba5dc4291b7d21b4778f47c6aebdf91f727055391843c23' 
  AND token = 'EU/tWlCXvU3ThtmkA665NJHcHGGNPhfYbxms2tbOExE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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