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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778698e382d97d61918b263d4c81890ac185cea273993a699d6629a155d0875a' 
  AND token = 'sC3QSs/HabuK5LVTdvWhNwOFwJ9ZTxi7oWvSjw8dj2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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