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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2265896c28967299681310cbf7ad69112cff8a6378361726b3696a567b015a22' 
  AND token = 'gfyssLN6tOMJDqLEGRZq1pq7o++tIzxse18CS3PTJZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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