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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c64a3279dc3a6bb642344b5d282eb86f48b1fbfe56d45a7dcbecca8e891ca47' 
  AND token = 'k7F4cGQkrRCc+TNA0TwXzuFZ29nLX512phRdy4LH8SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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