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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb42a5ff7bf4c3a000be6512a8a58f5e85c150826130e590b54c683a1d426120' 
  AND token = 'q1yM2027kowE7TfwbU0vzwHtBM90FdoL1L0l5i1eNOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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