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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28564a688a5db6804014f3b1332e3fd030446fedbedca752a98ef3d3cef3d5b1' 
  AND token = 'Z1D+V/tf8d0+LC0vxG4uVJit9t8jR5gAo8DBFi3nPfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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