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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f6296f005d7025f22f47a8eec8832905ed0210ca0c1aa7e662507cb651862d' 
  AND token = 'AwAhZBGdQyg4Qt1VOOTQlInc24UmlofPRR2qOuj7lb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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