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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b2d01f4439f3e54a6dd880ec866e0e46adb86d936d11093b397780208748f2' 
  AND token = 'fb3pSp3HDuU2NTkhVtlH4Ska1Z7qD2AXAt1q/t0Wogs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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