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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f911d2215907899844e64a67dbb284128ae4f6803b8cb0d214d11182c2e10352' 
  AND token = 'bSxiXEljIeyUiTgzYgaWuqEkwP4fLyWKkJ9zVooVFag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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