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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5bf3e0e111ce3f17290c23b96606105aba9d1d9b633a451ce17397ba3c1620' 
  AND token = 'VUb+ELo8TIGs2Qnh1V8PvnOfJjrQ2Kbg7JItrCCsgtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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