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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8298eda298bb6c4a57cbd75a9edf6c2d6744ad9f43da8acf7d8b73e12814b0bd' 
  AND token = 'YhjYnycFtQNjceW63RPQ2J9CF4Nu10UK51R9qTEEc8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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