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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d1c9aebab7b52e54092deafe1c235e030bf41962579cdef9fc8eae286e23d2' 
  AND token = 'iZfbGj2twotrQJfy5cr9YkI9mfDVAy7Kxj3puZfu00U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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