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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c2d5e9d859cde71b02b0af3d8ed14cf0a8e257c38d53e8dc174f8d69ecac1e' 
  AND token = '/dATC1whrIPAMBPDX7C3H5+3i5Wmyvi8YdaQnO89kaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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