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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deec6b8e2bb0e30932f6056d50fa4c9a27d35141327302acc4681bb6226194f5' 
  AND token = 'N8ocaMvyNjfVDQxOp9B6eAAgtGl3rLUGjPvSW1e16v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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