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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac60acb707b7af45921be5c015076be1d5f2a89d23761e91ee30a62a7c0c51e0' 
  AND token = 'H0UiVIE2TZI7z8u6mM/5rsJ0vBl3290z2attluUJTE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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