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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317b8f73d74fbd8e49ae2f00e29caf4f5647e84326f11311cef6a90d718ae45e' 
  AND token = 'PEp62G1li8qhVdS425jFkVG9rab39zfQInJX5UsfcG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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