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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206dd91966d6b36dcb1af01f23f5d8e9df076c3ba1514c86dea619b9df1126ed' 
  AND token = 'B7WVX/7SGXzkq99RdYiDNRZfyT2qJ4nBldm4eCKIcaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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