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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab3d07d3829d984cb2d4cdbae60509b86fb09c50df82474c73defd9c1b3894d' 
  AND token = 'ZFpeLotr9H2hbmdlBPlqpWpiCehSMCTMEXe9siIrJ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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