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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6014427da2382b72569ac85761a7bc5184467fe3e2777a4647a2ca42ef3706' 
  AND token = 'h+RyqGudESmK243JXJEXVaeQQDQD9EEiWvYNdJkycWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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