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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cd5fac042511d5bc9216bba9eece8881c7d61852d839576d0810432f91ff2e' 
  AND token = '7CH85fy4+5iclCj+1CjPLkheYmQqmQ4PDdBxOynJLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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