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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d0fb5d742a428460128e0f33e8733814505bbe7f5037e97ab90e98bb8c6c4d' 
  AND token = 'Z0eFZsSz4AwB05eUdl2A1d7F/MSVBfjXSqaHaL/tXhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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