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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ee5041c422aa5c25c6710ffe319f9d36047628729c6d68ba8a1a5aacc3fd38' 
  AND token = 'Gx0yBq8z2DJxGAcnQJn2eM9yDzfIMS9+EjVN3aklx+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00167

JSON explain

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