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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cc3c2b900a96f672b579b0f664f7254ae312ebd519f2ada6926490972da2fd' 
  AND token = 'XhRS0++sNv3XzM3OKKR9GqMC5VIGEpo4lwWwc4U61lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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