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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72138fae31cf4f19ef8a162eab8bd63adb0099d8db92e4811561585600a17c1' 
  AND token = '+ahyWq3jeJZTPWDjkHcYuGNOsf+iSNuOxP5O3ctFhY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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