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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dbc48659e3e13585b4015105a31ede76065f5ba8cf7cdb97f9c84e0795ee2a' 
  AND token = 'O/79E9DPhyccrLlQ4T1RcpNXi9Fxa3XzMc1EB9Hq5GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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