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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2f09811931a42338c753c7c8dc1e95b2fd618a59d4f416505ad0b613790ef0' 
  AND token = 'bUeA4Gn4HEOFXP0N2xhdvcPmK3GlNC6W530hYaTqo3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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