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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6a961ab33876dbb5a58c3a5c0c92526509975143edd2eacf9b02a60d32114c' 
  AND token = 'BzTRePFlKL3dmo0mtbubGKbBrhehleYFER/OL0Zf6pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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