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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c310c07e2442396d455a78a1adc50abd125b1ad44ce78f1fe13d8d2ab38a8b77' 
  AND token = '+6aQeWVensQUOiu2Nc65Y2xrJkYfNzPPOwHA+2JdbNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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