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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2d58fea0e8df142e718d75f2a1f55eb6a5a078bce7ca3d1e6127f478f9f02f' 
  AND token = 'J0LvAn8OFbuGR13dmgM9oEZILlcBUWTtmGJEq523vao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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