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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa394f19de9ea4f1bba58c9de05aadb8a45528b117773b2cd92d827c2e3fd380' 
  AND token = 'zaG+R4OBSi80aoPR8RcSV9OrFSHHgLHEfqF+Kg5E7hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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